An Improved Energy Balance Approach and Its Application in CHAMP Gravity Field Recovery

作     者：XU Tianhe HE Kaifei XU Tianhe;HE Kaifei

作者机构：Xi＇an Research Institute of Surveying and Mapping 1 Middle Yanta Road Xi＇an 710054 China. 

出 版 物：《Geo-Spatial Information Science》 (地球空间信息科学学报（英文）)

年 卷 期：2008年第11卷第3期

页      面：168-173页

核心收录：

学科分类：0303[法学-社会学] 0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0705[理学-地理学] 0813[工学-建筑学] 0833[工学-城乡规划学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Supported by the National Natural Science Foundation of China (No.40604003  40474001). Acknowledgements: We are grateful to the ISDC of the GFZ Potsdam for providing the data and to Gerlach C. and Svehla D. at the TUM for the kinematic orbits 

主　　题：Earth gravity field model energy balance CHAMP kinematic orbit 

摘      要：An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach IS developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily Integration constant, scale and bias parameters. Two 60 degree and order gravitational potential models, XISM-CHAMPO1S from the classical energy balance approach, and XISM-CHAMPO2S from the improved energy balance, are determined using about one year＇s worth of CHAMP kinematic orbits from TUM and accelerometer data from GFZ. Comparisons among XISM-CHAMPO1S, XISM-CHAMPO2S, EIGEN-CGO3C, EIGEN-CHAMPO3S, EIGEN2, ENIGNIS and EGM96 are made. The results show that the XISM-CHAMPO2S model is more accurate than EGM96, EIGENIS, EIGEN2 and XISM-CHAMPO1S at the same degree and order, and has almost the same accuracy as EIGEN-CHAMPO3S.